Shin Megami Tensei IV - Story

Every year in the Eastern Kingdom of Mikado, all children who have turned 18 that year make a pilgrimage to Mikado Castle to take part in what is known as the "Gauntlet Rite," a traditional ceremony to determine a person's worthiness to join the elite ranks of the Samurai, noble warriors and protectors of the realm. You and your friend Issachar are from a simple village, and today is the day that your life may change forever...

Your name is Flynn (it is the default name and can be changed) and you see some people in a dream. You and your friend Issachar attend the Gauntlet ceremony and the protagonist meets the people he saw in his dreams, who have just become Samurai. He groups with them to chase after the Black Samurai, who has been turning the Casualties caste into demons.